chase



Aug. 12, 1930. G. c. CHASE CALCULATING MACI IINE Filed Aug. 12, 1929 2 Sheets-Sheet l Aug. 12, 1930.

G. C. CHAS? CALCULATING MACHINE Filed Aug. 12, 1929 2 Sheets-Sheet 2 //v VENTOR .6 fi 0141/ A TTOR EY Patented Aug. 12, 1930 UNITED STATES PATENT OFFICE GEORGE C. CHASE, OF SOUTH ORANGE, NEW JERSEY, ASSIGNOR TO MONROE CALCULAT- ING MACHINE COMPANY. 0}? ORANGE. NEW JERSEY. A CORPORATION OF DELA- WARE CALCULATING MACHINE Application filed August 12, 1929.

The invention has relation to calculating machines, and more particularly to machines wherein division is accomplished by subtracting a divisor from and by adding the same to a dividend registration in alternate ordinal places.

According to the invention, means are provided for reversing the direction of rotation of the numeral Wheels, to reverse the sign character of the registering movement, and provision is made for improving the operation of the machine.

The invention consists in the novel construction and combination of parts, as set forth in theappended claims.

In the accompanying drawings, illustrat; ing the invention;

Figure 1 is a side elevation of a calculating machine to which the inve'iition is shown as applied, the casing being broken away.

Fig.2 is an enlarged detail view-of the division lever and certain associated parts.

Fig. 3 is a detail plan view of the carriage shifting clutch and associated parts. Fig. 4 is a front elevation of the shifting mecha nism. Fig. 5 is an enlarged elevation of the division lever restoring means, with the carriage in extreme'left-hand position.

By way of illustration, the invention is shown in connection with the disclosures of the patent to George C. Chase Number 1,566,650 and the following applications of the same inventor: application 79,811,.filed January 7, 1926, entitled Automatic'control for calculating machines; application 213,637 filed August 17, 1927, entitled Division stop mechanism for calculators; application 226,- 418, filed October 15, 1927, entitled Carriage shift mechanism for calculators.

According to the disclosures of the abovenamed patent and applications, and of the well-known Monroe calculating machine to which they relate, amounts set up on the keyboard 18 are registered upon numeral wheels 13, mounted in carriage 2, upon operation of Serial No. 385,161.

the machine. This operation is performed by means of an electrically-operated drive mechanism fully disclosed in the above-noted patent.

The automatic operation of the machine is controlled by division lever 201, having a pin 205 engaging a latch lever 303, designed to raise lock lever 200 and to latch it in raised position upon movement of the division lever to operative position. Lock lever 200 in rising frees the operating means of the machine by removing the stop fromthe path of movement of rock arm 22, connected by link 21 with the shaft 4 carrying the selector gears. Division lever 201 is also designed to throw clutch yoke 111 into subtractive position, this being accomplished by means of a pawl 319, operable upon a tooth 208 of clutch yoke 111. This will start the machine in operation in a subtractive direction.

Division lever 201 in moving to operative position will engage a pin 2110f sliding tooth 209 mounted on clutch yoke 111, carrying said tooth into forwardly projecting osition, where it will be locked by means 0 a latch This tooth governs the automatic reversal of the selecting gears and other operative elements of the machine in the following manner:

Numeral wheels 13 being rotated until a transitional carry occurs (Patent 1,566,650) trigger 31 will be tripped by a pin on the numeral wheel associated with the highest order carrying mechanism, releasing an element 25 mounted at the end of a stop arm 24, so that element 25 will fall into the path of movement of a lug upon rock arm 22. As the selecting gears pass through their. fullcycle position, rock arm 22 will be swung forwardly, carrying therewith a stop arm 24, the latter arm being carried against a suitable fixed stop member, and further rotation of the selector gears in the original direction being thus arrested. As stop arm 24 is carried forwardly, a pin 145 mounted upona rearward extension of said arm wilt contact with a cam face of clutch yoke 111 and will move said yoke to neutral position, wherein the motor will be disengaged from the calculating devices. The selector gears and other rotating parts of the machine having been arrested by contact of stop arm 24 with the fixed stop, will rebound therefrom, this rebound being assisted by a suitable spring on arm 24, and

/in this movement a tooth 220 of link 21 will engage the slide tooth 209 and throw clutch yoke 111 in a direction to provide for reverse operation of the machine. At the same time, element 25 striking the end of trigger 31 will be raised out of engagement with the lug of rock arm 22 and the machine will thus be free to continue in operation.

The setting of division lever 201 to active position also effects a clutch governing the automatieshifting of the numeral wheel carriage 2, which carriage at the time maystand in any ordinal position, as set, for instance, by manipulation of the knob on shaft 46. For this purpose, a member 217 connects the division lever with a clutch hub 61 of division shift cam 60, loosely mounted on the carriage shifting shaft 46. Rotation of shaft 46 will shift numeral wheel carriage 2 by the wellknown means employed in the Monroe machine and illustrated in the applications hereinbefore referred to. Movement of the division lever to active position will move clutch hub 61 into engagement with a clutch member 62'fast upon shaft 46, so that counterclockwise movement of thisshaft, as viewed 1 from the front of the machine, will shift carriage 2 to the left. The shifting impulse is transmitted as follows:

A link 47 connects arm 24 with one arm of a bell lever 52, so that as arm 24 swings forwardly in the direction of the fixedstop, bell lever 52 will be rocked and, throughconnection 57, will move a shifting'lever- 55, having a roller operating upon cam 60 to impart rotary movement to the clutchhub 61 and shift the carriage.

Alternate forward and reverse operation of the machine will be continued, with shifting of the numeral wheel carriage at the end of each operation, until division lever 201 is returned to inactive position, either manually or by means, hereinafter described, operating automatically when the numeral wheel carriage has advanced to extreme left hand position. When the division lever is so returned, means will be set whereby the machine will be allowed tocomplete the re 'stration of the quotient figure which is t en being calculated, and will then be brought to rest with all parts restored to normal position. i

This means comprises a pin 219 carried by division lever 201, and so arranged that, when the division lever stands in inactive position, and clutch yoke 111 in additive clutch 21, and clutch yoke 111 will be left in neutral position. In the movement of the divlsion lever to inactive position, locking lever'200 will be released from latch 303 by the following means:

. A plate 307 pivoted to latch lever'303 is raised at its rearward end by the upward movement of pin 145 on stop arm 24 as this arm 'is carried rearwardly in the final arresting operation. Plate 307being raised by said pin, a cam face of the plate willvbe brought into contact with pin 310 on the retracted sliding tooth 209, this contact serving to push the plate forwardly'and disengage latch lever 303 from lockingdever- 200, which will thereupo'n fall under the influence of its spring.

The means for returning division lever 201 to inactive position when carriage 2 is'shifted to extreme left hand position, comprises a slide 311 having connection with division lever 201 and guiding engagement with stud 224. As the division lever is thrown to oper ative position, slide 311 will be advanced to a position with the free end thereof immediately overlying the path of movement of a crank pin 314 of the shaft 4. A lug 198 is provided on the carriage 2, said lug bein adapted as the carriage is lifted 'andvlowere into its extreme left hand position to depress the free end of the lever 223, contacting with and adapted to move slide 311 into the path of movement of pin 314, against the tension' of a suitable spring. In the ensuing movementof the actuating mechanism, pin 314, contacting with slide 311, will push division lever 201 forwardly to inactive position.

For-example, to divide 144 by 18, set the number 144 in the accumulator wheels, clear the counting wheels and set 18 in the keyboard, in line with the figures 14 on the accumulator wheels. Upon setting of the division lever to operative position, 18 will be subtracted from 14, giving an accumulator wheel reading of 99964 and a counting wheel reading of 1. Thecarriage will now be antomatically shifted, so that the amount 18 in the keyboard will be in line with the figures 64 in the accumulator wheels and so that the counting wheels will read 10. Upon further operation of the machine, 36 (twice 18) will be added to 99964 in the accumulator wheels, and 2 will be subtracted from 10 in the counting wheels, whereupon the machine will be stopped with the cmrect remainder (1 0908) and the correct quotlent 8} ippwaung iii the accumulator wheels and wheels respectively.

Accumulator Counting wheels wheels (rill-l4 00 Original registration 18 +1 99964 10 After first ope ation 2 00000 p 8 After second operation I claim:

1. In a calculating machine having an ordinally shiftable carriage, numeral Wheels thereon, and means for rotating said wheels; means operable to reverse the direction of rotation of the numeral Wheels and to shift the carriage to the next arithmetical order, including elements operable to determine both actions as the numeral wheel registration changes from positive to negative and as said registration changes from negative to positive.

2.. In a calculating machine having an ordinaily shiftable carriage, numeral wheels thereon, and means for imparting registering movement to said Wheels; means operable to reverse the sign character of the registering movement and to shift the carriage to the next arithmetical order, including elements operable to preset the carriage to any one of its ordinal positions, and elements operable from such preset and from succeeding positions to determine such reversing and shifting action as the numeral wheel registration changes from positive to negative and as said registration changes from negative to positive.

3. In a calculating machine having an ordinally shiftable carriage, numeral wheels thereon, and means for imparting registering movement to said wheels; means operable to reverse the sign character of the registering movement and to shift the carriage to the next arithmetical order, includin reversing elements actuated by sald means or imparting registering movement, and elements operable to determine such reversing and shifting action as the numeral wheel registration changes from positive to negative and as said registration changes from negative to positive.

4. In a calculating machine having an ordinally shiftable carriage, numeral wheels thereon, and means for imparting registering movement to said Wheels; means operable to reverse the sign character of the registering movement and to shift the carriage to the next arithmetical order, including elements operable to determine such reversing, and shifting action as the numeral wheel registration changes from positive to negative and in he combing as said registration changes from negative to positive, and elements operative in extreme shifted position of the carriage and adapted in cooperation with said first-named elements ta reverse the sign and thereafter to terminate the registration.

5. In a calculating machine having an orlinally shiftable carriage, numeral Wheels thereon, and means for imparting registering movement to said wheels; means operable to reverse the sign character of the registering movement and to shift the carriage to the next arithmetical order, including elements operable to determine such reversing and shifting action as the numeral wheel registration changes from positive to negative and as said registration changes from negative to positive, and elements operative in extreme shifted position of the carriage and adapted in cooperation with said first-named elements to reverse the sign only in response to a change from positive to negative registration in said position and to terminate the registration upon change from negative to positive registration.

} In a calculating machine having an ordinally shiftable carriage, numeral Wheels thereon, and means for imparting registering movement to said Wheels, including an operation control member; means operable to reverse the sign character of the registering movement and to shift the carriage to the next arithmetical order including elements operable to determine such reversing and shifting action as the numeral wheel registration changes from positive to negative and as said registration changes from negative to positive, said means being adapted upon manual adjustment of the operation control member to inactive position to terminate the registration only as the numeral wheels next change from negative to positive registration.

Signed at Orange, in the county of Essex and State of New Jersey, this 7th day of August A. D. 1929.

GEORGE C. CHASE. 

